remove unneccessary files, re #3475

git-svn-id: svn://develop.studip.de/studip/trunk@27228 c5b85792-5220-0410-ad23-ed5b6b8ad999
scm: use stud.ip's tickets instead of diy approach when approving deletion requests, re #3557

git-svn-id: svn://develop.studip.de/studip/trunk@27229 c5b85792-5220-0410-ad23-ed5b6b8ad999